fix link error with Window::platform_hide

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.0)
-set(CFLTK_PROJECT_VERSION 1.4.33)
+set(CFLTK_PROJECT_VERSION 1.4.34)
 
 project(
   cfltk
@@ -69,12 +69,17 @@ set(CFLTK_SRCS
     src/cfl_font.cpp
     src/cfl_utils.cpp
     src/cfl_prefs.cpp
-    src/Fl_Simple_Terminal.cxx)
+    src/Fl_Simple_Terminal.cxx
+    )
 
 if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
   set(CFLTK_SRCS ${CFLTK_SRCS} src/cfl_nswindow.m)
 endif()
 
+if(UNIX AND NOT APPLE)
+  set(CFLTK_SRCS ${CFLTK_SRCS} src/cfl_platform.cpp)
+endif()
+
 if(NOT ANDROID)
   set(CFLTK_SRCS ${CFLTK_SRCS} src/cfl_printer.cpp)
 endif()

include/cfl_macros.h

@@ -321,7 +321,7 @@ typedef void (*custom_draw_callback)(Fl_Widget *, void *);
         return ret;                                                            \
     }                                                                          \
     int widget##_take_focus(widget *self) {                                    \
-        LOCK(auto ret = self->take_focus());                                   \
+        LOCK(auto ret = ((Fl_Widget *)self)->take_focus());                    \
         return ret;                                                            \
     }                                                                          \
     void widget##_set_visible_focus(widget *self) {                            \

src/cfl_platform.cpp

@@ -0,0 +1,32 @@
+#include <FL/Fl.H>
+#include <FL/platform.H>
+
+#if defined(FLTK_USE_WAYLAND)
+extern "C" void wl_proxy_marshal(void *proxy, unsigned opcode, ...);
+#elif defined(FLTK_USE_X11)
+// extern "C" void XUnmapWindow(void *display, unsigned long win);
+// extern "C" void XMapWindow(void *display, unsigned long win);
+#else
+#endif
+
+extern "C" void cfltk_platform_hide(void *proxy) {
+    #if defined(FLTK_USE_WAYLAND)
+    if (FLTK_USE_WAYLAND == 1 && fl_wl_display()) {
+        wl_proxy_marshal(proxy, 1, 0, 0, 0); 
+        wl_proxy_marshal(proxy, 6); 
+    }
+    #elif defined(FLTK_USE_X11)
+    if (FLTK_USE_X11 == 1 && fl_x11_display()) {
+        XUnmapWindow(fl_x11_display(), (unsigned long)proxy);
+    }
+    #else
+    #endif
+}
+
+extern "C" void cfltk_platform_show(void *proxy) {
+    #if defined(FLTK_USE_X11)
+    if (FLTK_USE_X11 == 1 && fl_x11_display()) {
+        XMapWindow(fl_x11_display(), (unsigned long)proxy);
+    }
+    #endif
+}